I quite like no. 7, it was the brand I bought when I first started wearing makeup, and a lot of things I've bought over the years have been really very good. Of their current (recently revamped) product line, the sparkly glosses someone mentioned are good, and I got a free sample of a volumising mascara they do, which I found really surprisingly good, I may go back and enquire after it once my current mascara tube's done.
One of the big selling points about no. 7 is that every product is designed for very sensitive skins. So if you're a contact lens wearer or have allergies, it's not a bad place to have a look.
Their colour range is not the most exciting in the world, and I don't care much for their lipsticks at all, but overall no. 7 is a decent, reliable and gentle range.
And their nailvarnishes are really pretty. They do one at the moment with an interesting (and AFAIK unique) "quirk": they change colour radically on the application of a transparent top coat; the idea being, you can be out at work wearing a perfectly innocent and professional nail colour, champage, beige whatever - then at the end of the working day, slap on a topcoat and your nails turn a bright 'n vibrant "party" colour.
http://www.boots.com/brandtreatment/...tionid=1031582